Frogs in Hawaii: identification guide and best places to start

Where are you most likely to notice frogs in Hawaii?

Frogs in Hawaii are most active in warm, damp environments. Check backyards with dense vegetation, especially near water sources like ponds or drainage ditches. Wetlands, botanical gardens, and forest trails on the wet sides of islands (e.g., the Hilo side of the Big Island) are reliable. The coqui frog thrives in lowland areas and can be found even in suburban neighborhoods. Listen for its distinctive two-note call at dusk and through the night.

What season or weather patterns improve your chances of spotting frogs?

Hawaii's mild climate means frogs are active year-round, but they are most noticeable during the rainy season (November through March) when humidity is highest. After a heavy rain shower is the absolute best time to go looking. Frogs also call more frequently on warm, humid evenings. During drier months, focus on areas that stay moist, like shaded valleys or near streams.

How can you identify common frogs and separate them from lookalikes?

The most common frog is the coqui: small (1-2 inches), brown or gray, with a round body and toe pads that let it climb. Its call is a loud, high-pitched 'co-KEE!' that is easy to distinguish. The greenhouse frog is smaller (under 1 inch), brown with a dark stripe, and calls in a short chirp. The cane toad (a toad, not a frog) is much larger (4-6 inches), warty, and has a dry, bumpy skin. Native frogs are very rare; you are almost certainly seeing introduced species. For a broader ID guide, check our frog identification hub.

See our state animal guide for the next step.

What are the best practices for a frog spotting session?

Go out after sunset with a red flashlight (red light least disturbs wildlife). Move slowly and listen first. Focus on areas with leaf litter and dense ground cover. Take a photo if you can, noting size, color, and any markings. Keep a journal of where you hear calls to return later. For more on Hawaii's wildlife sites, explore our Hawaii wildlife guide.

What are the most common frog species you'll see in Hawaii?

The coqui frog is by far the most common and widespread. The greenhouse frog is also common but quieter. The green and black poison dart frog (introduced) can be found on Oahu's Manoa and Waianae mountains. The bullfrog is present but less common. All are non-native. If you want to learn more about frog ecology, our frog species profiles have detailed information.